You Pick Printers Who Don't Guarantee Their Work.
All reputable printers guarantee their work automatically. This means if they make a mistake on your printing, they will re-run your job at no charge.
Unfortunately, there are unethical printers who won't do this. Instead, they won't make good on your printing and may not take any responsibility for their mistakes.
An unethical printer may hold your artwork hostage. Or may say they will fix your printing, but pin the problem on you and tack on an extra charge. There are about a hundred other things a not-so-good printer may do to you.
The best thing you can do is pick a printer who unconditionally guarantees their work. If it's not printed right and it's their mistake, they will run it again.